Electric loom controlling means



5 17, 1948. v. F. SEPAVICH Em 2 436,022

ELECTRIC LOOM CONTROLLING MEANS Filed May 21, 1945 3 Sheets-Sheet 1 ATTORNEy 1943- v. F. SEPAVICH ETAL ELECTRIC LOOM CONTROLLiNG' MEAN s 3 Sheets-Shut 2 Filed May 21, i945 FIG. 2

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v. F. SEPAVICl-l ETAL meme LOOI comonuue ms Fnee may 21, 1945 s Sheets-Sheet s auvsmms Patented Feb. 17, 1948 UNITED STATES PATENT OFFICE ELECTRIC LOOM CONTROLLING MEANS Victor F. Sepavicli and John C. Manoog. Worcester, Mass. asslgnors to Crompton & Knowles of Massachusetts Loom Works, Worcester, Mass, a corporation Application May 21, 1945, Serial No. 594,964

12 Claims. (01. 139-233) mg of fine fabrics it has been found desirable to employ an electric weft detector. We have recently proposed a very sensitive electric weft detector controlling a circuit including an electronic tube which is responsive to a very brief contact atv the weft detector. In such an electric weft detector system the current flowing through the detector at the time of indication is very small and avoids arching at the bobbin.

Electric warp stop motions generally employ a contact bar having two electrodes one of which is insulated from the other and wherein a fallen drop wire connects the two electrodes. As heretofore made such warp stop motions have operated with solenoids which are actuated by an electric current passing through the fallen drop wire. This current is always relatively large and tends to burn the drop wire.

It is an important object of our present invention to provide an electric controlling system for a loom wherein the electric weft detector "and the warp stop motion both operate when giving their indications to vary the grid potential of an electronic tube. By such an arrangement the indicating current is very small for both the detector and the warp stop motion and arcing in the shuttle and also burning of the drop wires is eliminated.

The weft detector will ordinarily operate during a short intei'val when the lay is at front center and cannot operate throughout the remainder of the loom cycle. The drop wire of a defective warp thread, however, can fall at any time throughout the loom cycle, including the interval during which the detector operates. It is a further object of our invention to provide control circuits including twoelectromagnetic devices, such as relays, one for the weft detector and the other for the warp stop motion, and control their times of operation by a part synchronized with the loom and operating to prevent indication by the warp stop motion during the weft detecting interval. This feature of our invention utilizes an electronic tube common to I the detector and warp stop motion but connectable to only one of them at a time and further utilizes selective means for determining which of the electromagnetic devices is to be operated by the tube when the latter is fired.

With these and other objects in view which will appear as our description proceeds, our invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein a convenient embodiment of our invention is set forth,

Fig. 1 is a side elevation of a loom showing a weft replenishing mechanism and warp stop motion and having our invention applied thereto,

Fig. 2 is an enlarged side view of the replenishing mechanism and associated parts shown in Fig. 1, the lay and shuttle being in section,

Fig. 3 is an enlarged horizontal section on line 3-3 of Fig. 2,

Fig. 4 is an enlarged end elevation looking in the direction of arrow 4. Fig. 3,

Fig. 5 is an enlarged front elevation of the inner part of the replenishing mechanism showing the manner in which the latter is controlled by the weft detector, I

Fig. 6 is an enlarged elevation of one of the drop wires of the warp stop motion and showing th contact bar and warp supporting bars in cross section, and

Fig. 'l is a diagrammatic view showing the circuits used with our invention.

Referring particularly to Fig. 1, the loom frame it, lay Ii, warp beam i2, whip roll it and top and bottom shafts i4 and i5 may be as usually employed. The warp W leads upwardly from the warp beam over the whip roll and then forwardly or to the left as viewed in Fig. 1 through a warp stop mechanism designated generally at A. This mechanism will include one or more contact bars it, although only one is shown in the drawings. Contact bar I 6 has an outside grounded electrode l1 and an upper electrode i 8 supported by but insulated. from the electrode ll. A drop wire IQ, of which there will be many on bar i8, is arranged as suggested in Fig. 6, this drop wire having an upper slot 20 the top end of which is beveled as at 2|. The drop wire is located between separator bars 22 on which the warp rests. and ordinarily the drop wire is in the raised full line position shown in Fig. 6. When any drop wire falls due to breakage or undue slackness of the associated warp thread the beveled edge 2i thereof will engage the top of insulated electrode i8 and tend to inove the drop wire laterally into 3 engagement with the grounded electrode l1. When this happens the two electrodes are electrically connected and this connection between them y can be utilized to stop the loom so that the weaver can correct the warp fault. The warp stop motion shown herein is given for illustrative purposes only and it is to be understood that so far as certain features of our invention are concerned any type of warp stop motion can be employed wherein two normally insulated members are electrically connected by a fallen drop wire.

The weft replenishing mechanism comprises a magazine M which may be of the multicolor type similar to that shown for instance in prior patent to Ryon, Patent No. 1,030,748, and carries reserve bobbins not shown for the replenishment of a shuttle S which will be on the lay and under the magazineon both the detecting and replenishing operations of the loom. The magazine comprises vertical slides 25, one of which is shown in Fig. 5, for the purpose of controlling bobbin delivery from the bottom of the magazine. This slide is provided with upper and lower lugs 26 and 21 between which is mounted a finger 28 secured to a shaft 29 rockable on the magazine frame 30. A red 3| extends downwardly from a lever 32 pivoted on shaft 29 and is connected as at 33 to the left end of a floating lever 34 pivoted as at 35 to the upper end, of a block 36. The latter is slidable vertically in a fixed hearing 31 and is connected at its lower end to a rod 38 the bottom of which is attached to the forward end of a lever 39 pivoted on the loom as at 46, see Fig. 1. The rear end of lever 39 is operatively related to a cam 4i secured to the bottom shaft l5. This cam is so designed that it moves the block 36 downwardly at the time of the detecting interval when the lay is at front center and the shuttle is under the magazine. At a later time in the loom cycle the cam 4i lifts the block 36.

The finger 28 is controlled by the lever 34 as the latter rises and falls with the block 36. A controller pin 45 is under lever 34 when an indication of weft exhaustion is given by the de- 45 tector D during the detecting interval, and when in this position lever 34 moves down to the dot and dash position shown in Fig. 5, thereby rocking lever 32 in a counter-clockwise direction, Fig. 5, and lifting finger 28 so that it elevates lug 26 on vertical slide 25. Thereafter as the block 36 rises a stop 46 causes lever 34 to rise to the dotted line position shown in Fig. 5 to depress finger 28 and cause the latter to lower lug 21 hereinafter and lifts the link 53 into the path of lever 52. whereupon the latter rocks the lever 49 and by means of rod 48 rocks the shipper handle 41 in a clockwise direction as viewed in Fig. l, or rearwardly, to eflect loom stoppage. The mechanism K may be similar to that shown in prior patent to Payne No. 1,873,465.

A weft detector D is of the electrical type and comprises a body of insulating material 60 having metallic detector prongs or fingers 6i and 62 slidable therein and also slidable through electrodes 63 and 64 to which are connected wires 65 and 66, respectively. Theshuttle S is provided with a bobbin B having a metallic ferrule F' by means of which the prongs 6i and 62 can be electrically connected when weft exhaustion occurs in the shuttle. The detector may be mounted on any convenient base 61 carried by a support 68 held fixed with respect to the magazine M. Rotatably mounted on support 68 is a small shaft 69 the left end of which as shown in Fig. 3 has secured thereto a lever 16 the upper end of which is connected to the previously described controller or pin 45. A torsion spring Ii acts norto the left as viewed in Fig. 2 out of the path of lever 34.

A bracket 12 mounted on the support 68 has held in fixed position thereon a solenoid 15 the core 16 of which is connected to a lever 'll secured to shaft 69. The core 16 is normally down, being held so by gravity and also by the action of spring H. but when solenoid I5 is energized shaft 69 is rocked in a clockwise direction as viewed in Fig. 1 to move controller pin under lever 34.

Except for the solenoid l5 and as noted hereinafter the matter thus far described is of common construction and of itself forms no part of our present invention.

In carrying our invention into effect we provide two switches G and H mounted on a small stand 89 secured to the loom frame adjacent to the bottom of a lay sword ill. The switches have extending arms 82' and 83 in position to be engaged by an actuator 85 secured to the lay end 8|. These switches are both of the double pole type and tend by their resilience to move to one position for closing one of their contacts but are moved by the actuator 84 to another position to close another of their contacts. The purand slide 25 to deliver a reserve bobbin not shown. and the various wires, resistances and condensers Lever 34 moves to the dot and dash positon of Fig. 5 only upon indication of weft exhaustion when the lay is on front center and the shuttle is under the magazine, but it moves to the dotted line position every second pick of the loom This lever ordinarily passes to one side of a link.

53 pivoted on lever 49 and said link will remain stationary as will also rod 48 and shipper handle 41 under normal loom running. When a fault in the warp occurs,- however, a solenoid 55 shown in Fig. 7. Under normal conditions the tube E is inactive, being maintained so by its grid 85 which is sufilciently negative with respect to the cathode 86 to prevent firing of the tube. The electrons collected on the grid 85 are prevented from discharging by a high resistance 81 in the following grid circuit: binding post 88. wir 89, resistance R, wire 96, cathode 86. grid 85, wire 9|, resistance 91, post 92 and wire 93 back to 5 post 88.

When the lay is on front center switches G and H will be as shown in full lines in Fig. 7 and under ordinary weaving conditions the grid will prevent firing of the tube. When indication of weft exhaustion is given by the detector. however, the resistance 81 will be short-clrcuited by the following detector grid signal circuit: post 94, switch G. contact 95, wire 65, finger 6|, ferrule F, finger 62, wire 66, and post 92. Closure of this will be energized in a manner to be described is circuit short-circuits the high resistance 81 and permits discharge of the electrons on the grid. whereupon the latter has its potential changed in such away as to permit the tube to operate so that electrons can flow from the cathode 88 to the plate P in the tube E. Current now flows in the following detector relay circuit: post 88, wire 89, resistance R, wire 90, cathode 88, through the tube to plate P, wire 96, switch H, which will be in the full line position shown in Fig. 7, contact 91, wire 98, resistance R, relay 99, wire I00, and wire IOI back to the other side of the 'power line at binding post I02. At the same time electrons flow from wire 98 down through a condenser C to wire I to charge the condenser. The condenser and relay are in parallel across wires 98 and I00.

Upon opening of the detector contact in the shuttle by movement of the ferrule away from the fingers 6i or 82, the condenser discharges through resistance R tains the latter energized for an appreciable length of time.

The armature I 03 of the relay is thereupon raised to close the following detector solenoid circuit: transformer T, wire I04, solenoid I5, wire I05, contact I08, armature I03, wire I01, back to the opposite side of the transformer, This results in energization of the solenoid with resultant turning of shaft 89 to place controller pin 45 under lever 34. Immediately thereafter cam 4| operates to lower lever 34, whereupon finger 28 is raised to initiate a change in loom operation, such as setting the magazine M for a transfer operation, as already described. When the type of magazine control set forth herein has been used heretofore it has been necessary to set the feeler or weft detector so that it would hold the pin 45 under lever 34 long enough to permit a complete downward motion of block 38. In the present instance condenser C is made sufficiently large so that when discharging through resistance R and the relay 99 it can maintain the detector solenoid circuit closed long enough to keep controller pin 45 in its rear indicating position for substantially the same length of time as that existing in previous constructions employing the pin 05.

It is to be understood that the operation of the parts of the circuit shown in Fig. 7 just described occur when the lay is in front position and the actuator 84 has moved the switches G and H into engagement with contacts 95 and 91, respectively. Switches G and H will be in these positions for a very short interval only, and as soon as the lay starts to move rearwardly from back center the switches will move into engagement with contacts IIO and I I I, respectively. The switches will have engagement with these last named contacts throughout the greater part of the cycle of one pick of the loom, and it is these latter contacts which control the warp stop feature of the invention.

When switch G is in the dotted line position shown in Fig. 7, contact IIO will be connected to I electrode ll of the contact bar I6 by means of the wire I I2. while the insulated electrode I8 of the contact bar will be connected to post 92 by means of wires H3 and 86. So long as all the drop wires are raised high resistance 81 is theonly connection between posts 92 and 94 and the tube E will be prevented from firing. When a drop wire falls, however, to the dotted line position shown in Fig. 6, electrodes I1 and I8 are electrically connected and the following warp stop grid signal circuit will be closed: post 92, wire 68, wire II3, insulated contact I8, the fallen drop wire I9, electrode I1,

and the relay 99 and main-' 6 wire II2, contact IIO, switch G, (in dotted lines) and post 94. This circuit short-circuits the resistance 81 and the tube fires as has already been described in connection with indication by the weft detector.

The following warp stop relay circuit is thereupon closed, having reference to the direction of electron'flow: post 88, wire 89, resistance R, wire 90, cathode 86, through the tube to plate P, wire 98, switch H (in dotted line position), contact I I I, wire II5, resistance R2, wire 8, relay III, wire H8, and wire IOI back to the otherside of the line at binding post I02. Unlike the detecting tripping circuit, this circuit remains closed as long as the drop wire is down and electrons therefore continue to flow through the tube E so long as the switches G and H are in the dotted line position indicated in Fig. 7 and until the drop wire is lifted, Because of the continued closure of this circuit it is preferable to protect the gas filled tube E by the resistance R2.

Current flowing through the relay II'I' lifts its armature I20 intoengagement with contact 'I2I, whereupon the following warp stop solenoid circuit is closed: transformer T, wire I22, solenoid 55, wire I23. contact I2I, armature I20, and wires I24 and I0! back to the transformer. The solenoid 55 is therefore energized and lifts link 53 into the path of lever 52,.and as the latter moves forwardly or to the left as viewed in Fig. 1 the loom will be stopped as already set forth.

It is to be understood from the foregoing that the detector grid signal circuit for the tube E and the detector relay circuit can be closed only for a very brief interval of time when the ferrule is engaging fingers 8| and 82 while the lay is at front center. Under these conditions the actuator 84 moves the switches G and H to a position corresponding to the full line position thereof indicated in Fig.7. After the detecting interval has been completed the lay moves rearwardly and the switches G and H move to the dotted line position indicated in Fig. 7. whereupon the warp stop grid signalling circuit for the tube E and the warp stop relay circuit canbe completed. From this it will be seen that there is no opportunity for the detector part of the circuits to be closed at the same time that the warp stop parts thereof are closed, and it will further be seen that a single electronic tube serves for both the detecting and warp stop features of the invention.

Certain parts of the electric connections shown in Fig. 5 are grouped together in a box I25 shown at the right hand side of Fig. 1. This box is mounted at the back of the loom and is fed by power wires I26 and I 27 leading from the main switch box I28 which controls the loom motor not shown. The tube E. transformers T and '1". relays 99 and Ill, and resistances can all be located in this box I25. While we have shown the trans formers T and T as separate units, yet they can if desired be combined into one transforming unit having multiple windings.

From the foregoing it will be seen that we have provided a combined electric weft detector and electric warp stop motion system employing a single electronic tube. Switches G and H are controlled so that either the detector signal circuit for the tube and the detector relay circuit can operate, or the warp stop signal circuit and the warp stop relay circuit. We do not wish necessarily to be limited tothe exact location of the switch H with respect t that part of the circuit to the right of tube E as shown in Fig. 7. As shown, however, the switch H will charge the cond'enser C only upon indication of exhaustion by the detector, while the relay for the warp stop solenoid may be energized by its own circuit which does not include the condenser. It will also be seen that the lay controls the two switches G and H in such a way that the tube E is alternately usable in two different groups of circuits but can be in only one of them at a time.

Having thus described our invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and we do not wish to be limited to the details herein disclosed, but what we claim is:

1. In a loom having an electric detector contact which is closed upon indication of weft exhaustion and having also a warp stop contact which is closed upon occurrence of a warp fault, the loom having a detector electromagnetic device which when energized initiates a weft replenishing operation and having also a warp stop electromagnetic device which when energized eifects loom stoppage, an electronic tube provided with a grid normally in such electric condition as to prevent passage of electric current through the tube, said grid when in indicating abnormal condition permitting electric current to pass through the tube, grid control means operative upon closure of either the detector or warp stop contact to create an indicating abnormal condition of the grid, provided the grid control means is connected to the closed contact, a pair of electric circuit means, one of the latter including the tube and the detector device and effective when closed and current flows through said tube to energize the detector device, and the other of said pair of electric circuit means including the tube and the warp stop device and eil'ective when closed and current flows through said tube to energize the warp stop device, and electric control means operative during one period in the cycle of loom operation to connect the detector contact to said grid control means and also close said one of said pair of circuit means, and operative during another period in the cycle of loom operation to connect said warp stop contact to said grid control means and close the other of said pair oi circuit means.

2. In a loom having an electric detector contact which is closed upon indication of weft exhaustion and having also a warp stop contact which is closed upon occurrence of a warp fault, the loom having a detector electromagnetic device which when energized initiates a weft replenishing operation and having also a warp stop electromagnetlc device which when energized effects loom stoppage, an electronic tube having a grid which is normally in such electric condition as to prevent the flow of electric current through the tube, grid control means operative upon closure or either the detector or the warp stop contact to cause said grid control means to create an abnormal condition of the grid which enables current to flow through said electronic tube, provided the grid control means is connected to the closed contact, an output circuit including the tube and the detector device effective when closed and current flows through the tube to energize the detector device, a second output'circuit including the tube and the warp stop device effective when closed and current flows through the tube to energize the warp stop device, and selector means operative during one'period in the cycle of loom operation to connect the detector contact to said grid control means to create an abnormal condition of the grid if said detector contact is closed and also close the first output circuit dur ing said one period, said selector means operative during another period in the cycle of loom operation to connect the warp stoplcontact to said grid control means to create an abnormal condition of the grid if said warp stop contact is closed and also close the second output circuit during said other period.

3. In a loom havingnnlelectricdetectohcontact which is closed upoxf indication of weft exhaustion and having also a warp stop contact which is closed upon occurrenc of a warp fault, the loom having a detector electromagnetic device which when energized initiates a weft replenishing operation and having also a warp stop electromagnetic device which when energized eflects loom stoppage, electronic circuitoneans located electrically intermediate the detector and warp stop contacts and the detector and warp stop electromagneticdevices and being common to said contacts and devices, an electronic tube forming part of said electronic circuit means and provided with a grid, grid control means operative when both of said contacts are open to cause the grid to prevent flow of electric current through the tube but operative when connected to either contact to cooperate with said grid control means to cause the grid to permit current to flow through the tube if the detector contact is closed, and said selector means operative during another period in the cycle of loom operation to close the second output circuit only, and enable the warp stop contact it closed to cooperate with the grid control means to cause the grid to permit current to flow through the tube.

4. In a loom having an electric detector contact which is closed upon indication of weft 'exhaustion and having also a warp stop contact which is closed upon occurrence of a warp fault, the loom having a detector electromagnetic device which when energized initiates a weft replenishing operation and having also a warp stop electromagnetic device which when energized effects loom stoppage. an electronic tube including a grid which when in normal condition prevents flow of electric current through said tube, grid control means connectable to said contacts one at a time and effective when connected to a closed contact to create an abnormal condition of the grid which permits electric, current to flow through the tube, a pair of output electric circuit means clOSable one at a time and each including the tube and one including the detector device and the other including the warp stop device each output circuit means when closed and current is flowing through the tubeeffective to energize the corresponding device, and control means for said output circuit means and said contacts requiring the grid control means to be electrically connected to the detector contact whenever the first output circuit is closed and requiring the grid control means to be electrically I 5. In a loom having an electric weft detector contact which is closed upon indication of weft exhaustion and corresponds to a detector electromagnetic device which when energized initiates a weft replenishing operation, the loom having also a warp stop contact which is closed upon occurrence of a Warp fault and corresponds to a warp stop electromagnetic device which when ener-' gized causes loom stoppage, an electronic-tube including a grid which when in normal condition prevents flow of current through the tube, grid control means connectable to said contacts one at a time and eflfective when connected to a closed contact to create an abnormal condition of the grid which permits current to flow through the tube, a pair of device circuit means closable one at a time and each including the tube and one of said devices, each device circuit when closed and current is flowing through the tube causing energization of the corresponding device, and selector means causing the contacts to be connected alternately to the grid control means and closing each device circuit means when the corresponding contact is closed.

6. In a loom having an electric detector contact which is closed upon indication of weft exhaustion and having lso a warp stop contact which is closed upon occurrence of a warp fault, the loom having a detector electromagnetic device which when energized initiates a Weft replenishing operation and having also a warp stop electromagnetic device which when energized effects loom stoppage, an electronic tube having a grid, control means for the grid including a resistance which normally enables the grid control means to cause the grid to prevent flow of current through the tube but which when shortcircuited enables the grid control means to cause the grid to permit electric current to flow through the tube, each contact when closed and connected to the resistance shortcircuiting the latter,. an output circuit including the tube and the detector device, a second output circuit including the tube and the Warp stop device, each output circuit when closed and current is flowing through the tube causing energization of the corresponding device, switch means to connect said output circuits one at a time to said tube, and a second switch means connecting said grid control means to said contacts one at a time, both of said switch means being coordinated so that said grid control means is connected to the detector contact when the first output circuit is closed and the grid control means is connected to said warp stop contact when said second output circuit is closed.

7. In a. loom having an electric detector contact which is closed upon indication of weft exhaustion and having also a warp stop contact which is closed upon occurrence of a warp fault, the loom having a detector electromagnetic device which when energized initiates a weft replenishing operation and having also a Warp stop electromagnetic device which when energized effects loom stoppage, an electronic tube having a grid, a switch capable of assuming two positions, electric circuit means including the tube connected to the detector device when said switch is in one position thereof and connected to the warp stop device when said switch is in the other position thereof, a second switch capable of assuming two positions, grid control means connected to the second switch and to said grid and operative when connected by said second switch to either of said contacts when the latter is open to cause the grid to prevent flow of current 75 through the tube and the electric circuit means.

ing the first switch to said one position thereot when the second switch is connected to the detector contact, and moving the first switch to the other position thereof when the second switch is connected'to the warp stop contact.

8. In a loom having an electric detector contact which is closed upon indication of weft exhaustion and having also a warp stop contact which is closed upon occurrence of a warp fault, the loomhaving a detector electromagnetic device which when energized initiates a weft replenishing operation and having also a warp stop electromagnetic device which when energized e'ifects loom stoppage, electronic circuit means including an electronic tube having a grid normally effective to prevent flow of electric current through the tube, grid control means operative when either contact is closed and the grid control means is connected thereto to effect a change in the grid whereby electric current flows through the tube in said electronic circuit means, a switch in said electronic circuit means capable of assuming two positions and when in one position thereof conheating the tube to the detector device and when in the other position thereof connecting the tube to the warp stop device, and means coordinated with said switch connecting said grid control means to the detector contact when said switch is in said one position thereof and connecting said grid control means to the warp stop contact when said switch is in the other position thereof.

9. In a loom having an electric detector contact which is closed upon indication of weft exhaustion and having also a warp stop contact which is closed upon occurrence of a warp fault, the loom having a detector electromagnetic device which when energized initiates a weft replenishing opersaid warp stop contact during-loom operation, said grid control means when connected to a.

closed contact changing the condition of the grid so that electric current flows through said tube, a pair of electric circuit means alternately operative during loom operation to connect the tube to said detector device and said warp stop device so that current flowing through the tube will plenishing operation, and the other being a warp.

stop control system including a contact which is closed on breakage of a warp thread and a warp stop electromagnetic device which when energized eilects loom stoppage, energizing means for theelectromagnetic devices including an electronic contact which is closed upon indication of weft exhaustion and a detector electromagnetic device which when energized initiates a weft replenishing operation, and the other being a warp stop control system including a contact which is closed on breakage of a warp thread and a warp stop electromagnetic device which when energized effects loom stoppage, an energizing unit for the electromagnetic devices, controller means formin: part of the energizing unit and normally operative to prevent operation of the unit but operative when connected to a closed contact to cause operation of the unit and energization of the electromagnetic device connected thereof, and means operative to connect the energizing unit alternately to said systems during loom operation, said energizing unit including an electronic tube and the controller means being a grid in said tube.

12. In a loom having a detector contact which is closed upon indication of weft exhaustion and having also a warp stop contact which is closed upon occurrence of warp fault, theloom having a detector solenoid which when energized initiates a welt replenishing operation of the loom 12 detector relay, a detector circuit including the detector contact and detector relay, a detector solenoid circuit controlled by the detector relay which when energized eflects actuation of the detector solenoid, a warp stop relay. a warp stop circuit including the warp stop contact and warp stop relay, a warp stop solenoid circuit controlled by the warp stop relay which when energized effects actuation of the warp stop solenoid, a source of electric power common to all of said circuits, and two coordinated switches each connected to said source and flective to close said detector and detector solenoid circuits only at one time in the cycle of loom operation provided the detector contact is closed and eiiective to close the warp stop and warp stop solenoid circuits only at a different time in the cycle of loom operation provided. the warp stop contact is closed.

\ VICTOR F. SEPAVICH.

JOHN C. MANOOG.

REFERENCES CITED The following references are of record in the file of this patent:

and the loom having also a warp stop solenoid which when energized eflects loom stoppage, a

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